Fixing intersection type handling in code completion

[lahodaj]

Consider this sample:

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {
        get()./*code completion here*/
    }

    <T extends CharSequence & Runnable> T get() { return null; }
}

When the CC is invoked at the marked place, the CC window is empty. This is because the type of get() is an intersection type, and the CC does not handle intersection types. This PR is fixing that - luckily it seems it is enough to put case INTERSECTION to the list of type kinds to handle.

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[jtulach]

Thanks for the fix. I'll glad to have this working. I want to use this types in the API...